frontend: Small cleanups
Created by: ryanslade
A few small cleanups spotted while auditing use of CheckCurrentUserIsSiteAdmin.
Part of https://github.com/sourcegraph/sourcegraph/issues/20983
Created by: ryanslade
A few small cleanups spotted while auditing use of CheckCurrentUserIsSiteAdmin.
Part of https://github.com/sourcegraph/sourcegraph/issues/20983